Dementia is the name for a group of symptoms caused by disorders that affect the brain. It is not a specific disease.
People with dementia may not be able to think well enough to do normal activities, such as getting dressed or eating. They may lose their ability to solve problems or control their emotions. Their personalities may change. They may become agitated or see things that are not there.
Memory loss is a common symptom of dementia. However, memory loss by itself does not mean you have dementia. People with dementia have serious problems with two or more brain functions, such as memory and language. Although dementia is common in very elderly people, it is not part of normal aging.
Many different diseases can cause dementia, including Alzheimer's disease and stroke. Drugs are available to treat some of these diseases. While these drugs cannot cure dementia or repair brain damage, they may improve symptoms or slow down the disease.
Most causes of dementia are not preventable.
The risk of vascular dementia may be reduced by preventing strokes through:
- Eating healthy foods
- Quitting smoking
- Controlling high blood pressure
- Managing diabetes
Dementia usually occurs in older age. It is rare in people under age 60. The risk of dementia increases as a person gets older.
Most types of dementia are nonreversible (degenerative). Nonreversible means the changes in the brain that are causing the dementia cannot be stopped or turned back. Alzheimer disease is the most common type of dementia.
Another common type of dementia is vascular dementia. It is caused by many small strokes.
Lewy body disease is a common cause of dementia in the elderly. People with this condition have abnormal protein structures in certain areas of the brain.
The following medical conditions can also lead to dementia:
- Huntington disease
- Brain injury
- Multiple sclerosis
- Infections such as HIV/AIDS, syphilis, and Lyme disease
- Parkinson disease
- Pick disease
- Progressive supranuclear palsy
Some causes of dementia may be stopped or reversed if they are found soon enough, including:
- Brain injury
- Brain tumors
- Chronic alcohol abuse
- Changes in blood sugar, sodium, and calcium levels (dementia due to metabolic causes)
- Low vitamin B12 level
- Normal pressure hydrocephalus
- Use of certain medicines, including cimetidine and some cholesterol drugs
Dementia symptoms include difficulty with many areas of mental function, including:
- Emotional behavior or personality
- Thinking and judgment (cognitive skills)
Dementia usually first appears as forgetfulness.
Mild cognitive impairment (MCI) is the stage between normal forgetfulness due to aging and the development of dementia. People with MCI have mild problems with thinking and memory that do not interfere with daily activities. They often know about their forgetfulness. Not everyone with MCI develops dementia.
Symptoms of MCI include:
- Difficulty doing more than one task at a time
- Difficulty solving problems or making decisions
- Forgetting recent events or conversations
- Taking longer to do more difficult mental activities
Early symptoms of dementia can include:
- Difficulty with tasks that take some thought, but that used to come easily, such as balancing a checkbook, playing games (such as bridge), and learning new information or routines
- Getting lost on familiar routes
- Language problems, such as trouble with the names of familiar objects
- Losing interest in things previously enjoyed, flat mood
- Misplacing items
- Personality changes and loss of social skills, which can lead to inappropriate behaviors
As dementia becomes worse, symptoms are more obvious and interfere with the ability to take care of oneself. Symptoms may include:
- Change in sleep patterns, often waking up at night
- Difficulty with basic tasks, such as preparing meals, choosing proper clothing, or driving
- Forgetting details about current events
- Forgetting events in one's own life history, losing self-awareness
- Having hallucinations, arguments, striking out, and violent behavior
- Having delusions, depression, agitation
- More difficulty reading or writing
- Poor judgment and loss of ability to recognize danger
- Using the wrong word, not pronouncing words correctly, speaking in confusing sentences
- Withdrawing from social contact
People with severe dementia can no longer:
- Perform basic activities of daily living, such as eating, dressing, and bathing
- Recognize family members
- Understand language
Other symptoms that may occur with dementia:
- Problems controlling bowel movements or urine
- Swallowing problems
People with mild cognitive impairment do not always develop dementia. When dementia does occur, it usually gets worse over time. Dementia often decreases quality of life and lifespan. Families will likely need to plan for their loved one's future care.
Treatment depends on the condition causing the dementia. Some people may need to stay in the hospital for a short time.
Sometimes, dementia medicine can make a patient's confusion worse. Stopping or changing these medicines is part of the treatment.
Certain mental exercises can help with dementia.
Treating conditions that can lead to confusion often greatly improve mental function. Such conditions include:
- Congestive heart failure
- Decreased blood oxygen (hypoxia)
- Heart failure
- Nutritional disorders
- Thyroid disorders
Medicines may be used to:
- Slow the rate at which symptoms get worse, though improvement with these drugs may be small
- Control problems with behavior, such as loss of judgment or confusion
Someone with dementia will need support in the home as the disease gets worse. Family members or other caregivers can help by helping the person cope with memory loss and behavior and sleep problems. It is important to make sure the homes of people who have dementia are safe for them.